Half to joseph howe townsend



(No Model.)

N. MCDONALD.

WINDOW VBNTILATOR. Patented Apr. 1, 1890.

N. PETERS. PhMD-Wngnphur. Wnhi nnnnnnn C.

U ITE STATES PATENT OFFICE.

NEIL MCDONALD, OF TANGIER, NOVA SCOTIA, CANADA, ASSIGNOR OF ONE- I-IALFTO JOSEPH HOIVE TOl/VNSEND, OF SAME PLACE.

WINDOW-VENTILATOR.

SPECIFICATION forming part of Letters Patent No. 424,895, dated April 1,1890.

Application filed May 25, 1889.

To all whom it may concern.-

Be it known that I, NEIL MCDONALD, a citizen of Canada, residing atTangier, in the county of Halifax and Province of Nova Scotia,-Oanada,have invented certain new and useful Improvements inVVindow-Ventilation, of which the following is a specification.

The object of my invention is to allow fresh air to enter a room withoutcausing a draft,

and at the same time to have the window securely fastened.

Figure l is an elevation of a window having my improvements fittedthereto, the fresh 1 5 air comin gin between the two sashes, as shown bythe arrows. Fig. 2 is an elevation of a window, the lower sash raised toallow of my apparatus being either inserted or withdrawn.

Fig. 3 is a section on line a; on, Fig. 1. Fig. 4

is a section on line y 3 Fig. 1. Fig. 5 is an enlarged detail View ofthe catch or fastening.

E and F are two boards connected by means of the link composed of theflat pieces G and pins g. The parting-line P between these 2 5 twoboards Eand F runs in an oblique direction, as shown in Figs. 1 and 2.They are tongued and grooved at P by the tongue M and groove N, whichstrengthens the joint.

H H are two knobs, one on either board.

I is a spring-catch, having a projection t', and is turned over at thetop to form a finger-hold J. The projection '11 is adapted to engage theslot 0 in the bottom rail of the lower sash, and prevents the windowfrom 3 5 being openedfrom the outside.

The boards E and F are provided with pins K, adapted to fit into thesockets 7c in the window-frame D and hold the said boards down in place.A groove R is run round 40 the outer edge of the boardsE and F, in whichis secured a strip of rubber or other elastic substance L, whichprojects slightly beyond the edge of the boards.

The device is operated in the following manner: The lower sash of thewindow is opened and the board placed on the sill S and its pin K pushedinto its socket is, the board F being raised, thereby shortening thelength of the two boards, as shown in Fig. 2. The

Serial No. 312,075. (No model.)

w board F is then pushed down to the sill S, and

its pin K fits into the corresponding socket k. The boards E and F areof such a length that their edges c e fit tightly against the frame D D.The lower sash is then lowered, and the projection 1' on thespring-catch I engages the slot 0 in the lower rail O. The rubber stripL around the boards E and F and the tongued and grooved diy'ision at Pmake it air-tight and prevent all drafts. It will be seen that when theboards are in this position the lower sash is slightly raised, and atthe same time securely locked by the spring-catch I and the pins K K.hen the sash is in this position, the fresh air comes into the roombetween the Y meeting bar B of the upper sash and the glass a and themeeting bar A and the glass 1;, as shown by the arrows in Figs. 1 and 4,thereby allowing the passage of fresh air while the window is securelyfastened. The boards E and F are easily taken out by raising the lowersash and holding the board E down on the sill by its knob H and raisingthe board F by its knob H, thereby shortening the boards and releasingthe pins K from the sockets 7c.

I claim as my invention 1. The combination, with an ordinary sashwindow, of the boards E and F, divided obliquely at P, and having pins Kengaging the sockets k in the window-frame D, the link G, pin g,connecting the said boards E F, the tongue M and groove N, strengtheningsaid connection, the groove B andrubber strip L in the said boards E F,and the spring-catch I and slot 0 in the lower sash, substantially asand for the purposes set forth.

2. The combination, with a sash window,- of the boards E and F, dividedobliquely at P,

connected by the link G, pin g, and having pins K, fitting in thesockets 7c in Windowframe D, and the catch I, engaging the slot 0 in thelower bar G of the lower window-sash, substantially as set forth. Signedat Tangier this 13th day of August, 1888.

NEIL MCDONALD. In presence of- J OHN S. MASON, A. L. TOWNSEND.

